export default  {
	"title": '计算机系统结构_在线1',
	"testId": '83486',
	"praxiseList": [
		{
			"id": 127150,
			"title": "下列关于机器字长、指令字长和存储字长的说法中，正确的是（ ）。\nI. 三者在数值上总是相等的 \nII.三者在数值上可能不等 \nIII. 存储字长是存放在一个存储单元中的二进制代码位数 \nIV. 机器字长就是MDR的位数",
			"options": "[\"III, IV\",\"I, IV\",\"II, III\",\"I, III\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127151,
			"title": "若一台计算机的机器字长为4字节,则表明该机器（）。",
			"options": "[\"能处理的数值最多为4位二进制数\",\"在CPU中能够作为一个整体处理32位的二进制代码\",\"能处理的数值最大为4位十进制数\",\"在CPU中运算的结果最大为2的32次方\"]",
			"answer": "2",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127152,
			"title": "从用户观点看，评价计算机系统性能的综合参数是（）。",
			"options": "[\"指令系统\",\"主频率\",\"吞吐率\",\"主存容量\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127153,
			"title": "用一台主频为40MHz的处理器执行标准测试程序, 测试程序的指令条数(I)一共5000条。它所包含的混合指令数和响应所需的时钟周期如下表给出。这个处理器的MIPS数和程序的执行时间分别为：（）。\n指令类型            CPI    指令占比\n算术和逻辑           1      60%\n高速缓存命中的访存   2      18%\n转移指令             4      12%\n高速缓存失效的访存   8      10%",
			"options": "[\"2.24，112*10^(-4)秒\",\"89.6，112*10^(-4)秒\",\"17.9，2.8*10^(-4)秒\",\"2.24，2.8*10^(-4)秒\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127154,
			"title": "一般8位的微型机系统以16位来表示地址，该计算机系统的地址空间有多少个？",
			"options": "[\"65536\",\"65535\",\"1024\",\"256\"]",
			"answer": "1",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127155,
			"title": "存放欲执行指令的寄存器是？",
			"options": "[\"MDR\",\"PC\",\"MAR\",\"IR\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127156,
			"title": "将高级语言翻译成机器语言程序需借助于（）。",
			"options": "[\"解释程序\",\"链接程序\",\"汇编程序\",\"编译程序\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127157,
			"title": "将汇编语言翻译成机器语言需借助于（）。",
			"options": "[\"汇编程序\",\"编译程序\",\"链接程序\",\"解释程序\"]",
			"answer": "1",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127158,
			"title": "MAR和MDR的位数分别为（）。",
			"options": "[\"存储字长、存储字长\",\"地址码的长度、地址码的长度\",\"地址码的长度、存储字长\",\"存储字长、地址码的长度\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127159,
			"title": "CPU的CPI与下列哪个因素无关？",
			"options": "[\"指令集\",\"计算机系统结构\",\"计算机内部组织\",\"时钟频率\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127160,
			"title": "某字长为 8位的计算机中，已知整型变量 x、y的机器数分别为[x]补=1 1110100，[y]补=1 0110000。若整型变量 z=2*x+y/2，则 z的机器数为（）。",
			"options": "[\"0010 0100\",\"溢出\",\"1100 0000\",\"1010 1010\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127161,
			"title": "—1029的16位补码用十六进制表示为（）。",
			"options": "[\"8405H\",\"7BFBH\",\"0405H\",\"FBFBH\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127162,
			"title": "由3 个“1”和5 个“0”组成的8 位二进制补码，能表示的最小整数（）。",
			"options": "[\"—125\",\"—126\",\"—3\",\"—32\"]",
			"answer": "1",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127163,
			"title": "某八位计算机中，假定x和y是两个带符号整数变量，用补码表示，[x]补=44H，[y]补=DCH，则x-2y的机器数以及相对应的溢出标志OF分别是（）。",
			"options": "[\"8CH，1\",\"8CH，0\",\"68H，0\",\"68H，1\"]",
			"answer": "1",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127164,
			"title": "若[x]补=1，x1x2x3x4x5x6，其中xi取0或1，若要x>-32，应该当满足（  ）。",
			"options": "[\"x1为1，其他各位任意\",\"x1为0，x2……x6中至少有一位为1\",\"x1为0，其他各位任意\",\"x1为1，x2……x6中至少有一位为1\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127165,
			"title": "若[X]补=x0，x1x2...xn，其中X0为符号位，X1为最高位，若（  ），则当补码左移时，会发生溢出。",
			"options": "[\"X0=X1\",\"X1=1\",\"X1=0\",\"X0≠X1\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127166,
			"title": "x 和y 的类型都是 int.  对以下表达式，哪个是永远为真的表达式？",
			"options": "[\"((x >> 31) + 1) >= 0\",\"(!x | !!y) == 1\",\"(x ˆ (x>>31)) - (x>>31) > 0\",\"（(x  >> 31) & 0x1 )== x\"]",
			"answer": "1",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127167,
			"title": "假定有4个整数用8位补码分别表示：\nr1=FEH、r2=F2H、r3=90H、r4=F8H.\n若运算结果放置在一个8位寄存器中，下列运算会发生溢出的是？",
			"options": "[\"r1 × r4\",\"r2 × r4\",\"r2 × r3\",\"r1 × r2\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127168,
			"title": "ALU和核心部件是？",
			"options": "[\"移位器\",\"多路选择器\",\"加法器\",\"寄存器\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127169,
			"title": "下列有关浮点数加减运算的叙述中，正确的是（）。\nⅠ. 对阶操作不会引起阶码上溢或下溢\nⅡ. 右规和尾数舍入都可能引起阶码上溢\nⅢ. 左规时可能引起阶码下溢\nⅣ. 尾数溢出时结果不一定溢出",
			"options": "[\"仅Ⅰ、Ⅲ、 Ⅳ\",\"Ⅰ、Ⅱ、Ⅲ、 Ⅳ\",\"仅Ⅰ、Ⅱ、 Ⅳ\",\"仅Ⅱ、Ⅲ\"]",
			"answer": "2",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127170,
			"title": "按照IEEE754标准规定的32位浮点数用16进制表示为：41A4C000， 对应的十进制数为（）。",
			"options": "[\"4.59375\",\"-4.59375\",\"20.59375\",\"-20.59375\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127171,
			"title": "float型数据常用IEEE754单精度浮点格式表示。假设两个float型变量x和y分别存放在32位寄存器f1和f2中，若（f1）=CC900000H，（f2）=B0C00000H，则x和y之间的关系为（）。",
			"options": "[\"x>y且符号不同\",\"x<y且符号不同\",\"x<y且符号相同\",\"x>y且符号相同\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127172,
			"title": "假定变量i，f的数据类型分别是int、float。已知i=12345，f=1.2345e3，则在一个32位机器中执行如下表达式，结果为假的是？",
			"options": "[\"i==(int)(float)i\",\"i==(int)(double)i\",\"f==(float)(int)f\",\"f==(float)(double)f\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127173,
			"title": "某计算机存储器按字节存储，采用小端方式存放数据。假定编译器规定int型和short型长度分别为32位和16位，并且数据按边界对齐存储。某C语言程序段如下:\nstruct {  int a;  char b;  short c;} record;\nrecord.a = 273;\n若record变量的首地址为0xC008，则地址0xC008中内容及record.c的地址分别为（）。",
			"options": "[\"0x11, 0xC00D\",\"0x00, 0xC00D\",\"0x00, 0xC00E\",\"0x11, 0xC00E\"]",
			"answer": "4",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127174,
			"title": "采用规格化的浮点数最主要是为了（）。",
			"options": "[\"增加数据的表示范围\",\"增加数据的表示精度\",\"防止运算时数据溢出\",\"方便浮点运算\"]",
			"answer": "2",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127175,
			"title": "对于IEEE754单精度浮点数加减运算，只要对阶时得到的两个阶码之差的绝对值|△E|大于等于（   ），就无须继续进行后续处理，此时运算结果直接取阶大的那个数。",
			"options": "[\"128\",\"24\",\"25\",\"126\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127176,
			"title": "假定某计算机按字节编址，采用小端方式，有一个float型变量x的地址为 FFFF C000H，x=1234 5678H，则在内存单元FFFF C001H中存放的内容是（）。",
			"options": "[\"34H\",\"56H\",\"1234H\",\"5678H\"]",
			"answer": "2",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127177,
			"title": "IEEE754标准中的最近舍入模式可以用于二进制数，也可以用于十进制数。若要舍入成为有两个有效数字的形式，十进制数12.5 应该被舍入为（）。",
			"options": "[\"10\",\"13\",\"12\",\"11\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127178,
			"title": "缓存的地址映射中，若主存中的任一块均可映射到缓存内到任一块到位置上，称作（）。",
			"options": "[\"组相联映射\",\"全相联映射\",\"直接映射\",\"自动映射\"]",
			"answer": "2",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127179,
			"title": "主存和CPU之间增加cache的目的是？",
			"options": "[\"提高内存可靠性\",\"增加内存容量\",\"加快信息访问速度\",\"增加内存容量，同时加快访问速度\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127180,
			"title": "假设某计算机按字编址，cache有4个行（数据块），cache和主存之间交换的块大小为2个字。若cache的内容初始为空，采用2路组相联映射方式和LRU替换策略，访问的主存的字地址依次为0，1，2，3，4，5，6，7，8时，命中cache的次数是（）。",
			"options": "[\"4\",\"2\",\"6\",\"8\"]",
			"answer": "1",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127181,
			"title": "当访问cache系统失效时，通常不仅主存向CPU传送信息，同时还需要将信息写入cache，在此过程中传送给CPU和写入cache信息的数据宽度各为（）。",
			"options": "[\"块、块\",\"字、字\",\"字、块\",\"块、页\"]",
			"answer": "3",
			"type": "single",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127182,
			"title": "降低Cache失效率方法有增加Cache块大小、减少Cache的容量。",
			"options": "",
			"answer": "-1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127183,
			"title": "软件兼容即同一个软件可以不加修改地运行于系统结构相同的各机器,而且它们所获得的结果一样,差别只在于运行时间的不同。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127184,
			"title": "软件不修改或只经少量修改就可由一台机器移植到另一台机器上运行称为软件的可移植性。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127185,
			"title": "超标量处理机 、超长指令字处理机 、超流水线处理机 、超标量超流水线处理机是指令级高度并行的超级处理机。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127186,
			"title": "计算机高性能发展受益于电路技术的发展和计算机体系结构技术的发展。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127187,
			"title": "计算机组织是计算机系统的逻辑实现:计算机实现是计算机系统的物理实现。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127188,
			"title": "计算机系统结构研究的是硬件之间的功能分配以及对传统机器级界面的确定。",
			"options": "",
			"answer": "-1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127189,
			"title": "计算机体系结构:程序员所看到的计算机的属性,即概括性结构与功能特性。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127190,
			"title": "计算机仿真用机器语言解释，计算机模拟用微程序解释。",
			"options": "",
			"answer": "-1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		},
		{
			"id": 127191,
			"title": "经典计算机体系结构概念的实质3是计算机系统中软、硬件界面的确定,也就是指令集的设计,该界面之上由软件的功能实现,界面之下由硬件和固件的功能来实现。",
			"options": "",
			"answer": "1",
			"type": "charge",
			"hard": 1,
			"explain": "无",
			"regtime": "2021-03-18 10:39:21",
			"last_time": null,
			"iscorrect": 0,
			"user_answer": ""
		}
	]
}